Classification
621 - Applied physics
101
620 - Engineering & allied operations
86
530 - Physics
27
515 - Analysis
26
629 - Other branches of engineering
21
519 - Probabilities & applied mathematics
19
006 - Special computer methods
18
330 - Economics
12
551 - Geology, hydrology & meteorology
9
004 - Data processing & computer science
7
658 - General management
7
333 - Economics of land & energy
6
531 - Classical mechanics; solid mechanics
6
571 - Physiology & related subjects
6
300 - Social sciences
5
612 - Human physiology
5
000 - Computer science, information & general works
4
003 - Systems
4
500 - Natural sciences & mathematics
4
510 - Mathematics
4
523 - Specific celestial bodies & phenomena
4
534 - Sound & related vibrations
4
570 - Life sciences; biology
4
600 - Technology
4
900 - History & geography
4
153 - Mental processes & intelligence
3
338 - Production
3
501 - Philosophy & theory
3
610 - Medicine & health
3
005 - Computer programming, programs & data
2
301 - Sociology & anthropology
2
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
535 - Light & infrared & ultraviolet phenomena
2
541 - Physical chemistry
2
550 - Earth sciences
2
650 - Management & auxiliary services
2
809 - History, description & criticism
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
302 - Social interaction
1
304 - Factors affecting social behavior
1
306 - Culture & institutions
1
320 - Political science
1
331 - Labor economics
1
332 - Financial economics
1
337 - International economics
1
339 - Macroeconomics & related topics
1
360 - Social problems & services; associations
1
more ...